20644816

素因数分解:

$2^4\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{811}}^1$

素因数の和:899

約数の個数: 40

約数和(自身を含む): 42087584

約数和(自身を除く): 21442768

約数列:

[1, 2, 4, 8, 16, 37, 43, 74, 86, 148, 172, 296, 344, 592, 688, 811, 1591, 1622, 3182, 3244, 6364, 6488, 12728, 12976, 25456, 30007, 34873, 60014, 69746, 120028, 139492, 240056, 278984, 480112, 557968, 1290301, 2580602, 5161204, 10322408, 20644816]

約数ペア:

[(1, 20644816), (2, 10322408), (4, 5161204), (8, 2580602), (16, 1290301), (37, 557968), (43, 480112), (74, 278984), (86, 240056), (148, 139492), (172, 120028), (296, 69746), (344, 60014), (592, 34873), (688, 30007), (811, 25456), (1591, 12976), (1622, 12728), (3182, 6488), (3244, 6364)]